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Might be something wrong with the canister purge valve (like stuck open) so it allows fuel vapors to pass to the engine on idle or vehicle not moving (which it shouldn't do).

Try clamping the hose between the canister and the intake plenum if the hose is soft/flexible enough or disconnect the hose and block both sides (be careful what you use to block the intake plenum hole to prevent it being sucked in by the vacuum).

Do a test drive with the hose clamped/disconnected and see what happens.

I've got some time of today, so I'll give this a try. What should happen?

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My old distributor was a 35DM8 and the one I've borrowed is a 35DLM8. Does anyone know how to wire the ignition amp ? It's two pins on the ignition amp.

Hello Haakon,

Here is a generic circuit diagram of a typical (mid '80's period) Rover V8 electronic ignition where the amplifier can be either on the side of the distributor - 35DLM8 - or in an aluminium unit mounted adjacent to the ignition coil - 35DM8.

you may not need further info but just in case check out my post on this thread

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Ramon - I think your diagram is wrong, the ECU tach feed passes through the over-run relay contacts on route to the ECU.

Fridge,

My drawing applies to the Rover SD1 82-86 systems but I have been using it to illustrate the generic ignition process whenever it seems to meet the OP's queries.

You are however right for the period Range Rover System where the Rover SD1 mechanical vacuum overrun valve on the rear of the plenum was replaced by the vacuum cutoff relay interupting the ignition feed to pin 1 and cutting of all injection during over-run.

On the Rover SD1, during over-run, the Efi system crudely relied upon some additional air introduced via the mechanical vacuum valve intended to create a combustible mixture from the fuel injected at the throttle idle position PLUS fuel already condensed on the plenum/manifold walls which during over-run immediately evaporates, rather than having the resultant increased quantity of fuel get thro the the exhaust system, unburned, where it causes loads of popping and banging.